Draw the graph as a simple representation with no node
labels or edge labels and using the full Matplotlib figure area
and no axis labels by default. See draw_networkx() for more
full-featured drawing that allows title, axis labels etc.

Parameters:

G (graph) – A networkx graph

pos (dictionary, optional) – A dictionary with nodes as keys and positions as values.
If not specified a spring layout positioning will be computed.
See networkx.drawing.layout for functions that
compute node positions.